Gigantospora gen. nov. (Xylariaceae, Ascomycota) from decorticated twigs in the USA, a new combination for Anthostoma gigasporum
Lu, Bing-Sheng Hyde
Gigantospora gen. nov. is introduced to accommodate Anthostoma gigasporum, a species described from decorticated twigs collected in the USA. Gigantospora is characterized by immersed ascomata surrounded by stromatic tissue, clavate unitunicate asci with a short pedicel and a J+ discoid apical ring, and gigantic, black to brown, ellipsoidal ascospores, with a straight germ slit. These characters separate the taxon from Anthostoma. In Anthostomella species, ascomata are mostly hidden under a clypeus, asci have a subapical ring (not apical), and ascospores are smaller and brown.